Inductor generator



NOV. 23 1925- v J. L.- MILTON INDUGTOR GENERATOR Filed Nov. 22, 1918 5 Sheets-Sheet 1 Nbv. 23 1926. 1,607,840

J. L-. MILTON INDUGTOR GENE ATQR Filed Nov. 22, 1918 3 Sheets-Sheet 2 Ill extremities of the bifurcated pole.

Patented Nov. 23, 1926.

Parent o JOHN LEVJIS MILTON,

0F CLEVELAND, OHIO.

rnnuoron ennnnaron.

Application filed November 1918.

My improvements pertain particularly to the simplification of construction of an electric gene 'ator 0r magneto adapted especially for ignition purposes, together with the building of a device, the parts of which are so correlated as to provide a mechanism of relatively high magnetic and electrical efficiency, as an entirety.

Another purpose of the invention is to construct an electric generator capable of being manufactured and assembledeasily, without sacrificing rigidity.

Figure 1 is a cross sectional View of a magneto embodying my improvements with the distributor and timer shown in elevation. Fig. 2 is a sectional view on the line A A Fig. 1. Fig. 8 is a top view of the pole pieces. Fig. 1 is an isometric view of the ma neto base. Fig. 5 is a view on line B-B, Fig. 8. Fig. 6 is an isometric View of the non-magnetic material which is cast into the base and supports the polar extremities shown in Figs. 7 and 8. Figs. 7 and 8 are isometric projections of the polar Fig. 9 is an isometric view of the base with extended arms. Fig. 10 is an end elevation of the base with springs and a yoke attached to the rotor.

In the drawings '1 represents the base of the generator or magneto, which base is formed of magnetic material and constitutes one pole or pole piece of the generator. The member 1 has extensions 2-2 ofthe same material so proportioned as to support the bearings 8-3 of the rotor 4 with its shaft 5. The intermediate bearing supports 6 may be either of magnetic or non-magnetic material. These supports and the extensions 2-2 are extended so as not to conduct magnetism from the main circuit to an extent that would reduce the efliciency of the magnetic circuit. The other pole piece or member 32 is laminated and in this instance is bifurcated or in the form of a yoke with polar projections 8 and 8'. An important feature of this pole piece is the fact that it is formedin sections, including the main or body portion with its polar projections 8 and 8 and separate or separable polar extremities 9 and 10, so that the main or body portion of the pole piece including the polar projections can be removed from the structure without disturbing the polarextremities 9-10 which in accawlance with important feature Serial No. 263.752.

of the invention are secured to pole piece 1 by non-magnetic material 11 preferably die cast metal which is cast in contact with pole piece 1 and thereby united thereto. It is at once apparent that an integral. polar structure is formed, in which the polar faces definitely located with reference to the axis of the inductongenerator, independent of other supporting members. t will also be noted that the coil 12 and the pole yoke 32 can be assembled to the main machine without disturbing the polar structure in which the rotor, bearings and supports are to be first assembled. To the yoke 32 are attached magnetic blocks 13-14 preferably by rivets Ali-15. The yoke with its blocks is held to the polar structure by non-magnetic end plates 1617 as shown.

This construction is not only of value from amechanical standpoint but produces magnetic conditions whereby unique electrical effects are obtained. By extending the polar extremity 10 a wider and longer face is obtained with a coil of given inside dimensions than if the dimensions of the polar face were controlled by these limitations, which would be the case if the coil was wound and then slipped over the core. The polar ex remity 9 can also be enlarged independently of the-separable yoke 32.

By lengthening the solar extremities a wider inductor is possible which produces a more sudden magnetic interruption of the magnetism, when the generator is operated, with the result of greater current values in the windings, which produces better ignition than if the width of the pole faces and inductor were limited by the inside width of the coil.

The magnets 3131 are preferably L shaped with their like poles in magnetic contact with the yoke :32 and base pole piece 1 respectively, the contacting surfaces of each being substantially at right angles to each other as shown in the drawings. These magnets are held in place by a nonmagnetic strap 18 applied in the well known manner.

The condenser 19 is mounted inside generator as shown.

The contacting device 20 has a metallic core 21 in which a plunger and spring 23 is inserted in the hollow end.

The core is secured in an insulated body 22 by nut 24%., which also secures ametallie in which are termed, points 7 the Ice suitable cover, not shown. carries a conductor which transmits the current to the distributor 30.

29 is a conductor imbedded in the body 20 so as to form an auxiliary spark gap with the insulated side of the safety ap. 29 is not in direct metallic contact with anything. This auxiliary spark gap is to arrest the well known brush discharge incident to a high tension current passing he tween fixed metallic points and the coil an added protection. Experiments and practice have demonstrated the fact that the conductor 29 though unconnected with an metallic part but it al ged substantially as shown in proximity to of the po 26 prevents or minimizes the brush dischar e which ordinarily takes p l .ace oetween the points of the fixed spark gap under high current tension conditions.

In operation the rotation of the inductor is in a counter-clockwise direction viewed from Fig. 2. It concentrates the magnetic flux of themagnets 3l31 in the arm 8 ot the yoke 82 on which the winding placed then through the unwound arm v8.

I have not shown the details of the timer. distributor or circuit as any of several well known designs may be used.

lVhile I have shown my improvements in a magneto with one pole piece solid in form and the other one biturcntech it is obvious that these improvements are not limited to this specific form of construction. Both poles may be bifurcated or trinrcated one may be trifurcated and the other solid. In fact, many combinations are possible.

The integral polar construction described herein is of particular value when the generators rotor is oscillated by means of springs which is a general practice with slow speed stationary engines. In Figures 5) and 10 I have shown arms 31 and 31 cast on the polar extension 2. To these arms are attached the outer ends of the springs 3232, the inner ends of which are attached to the ends of the yoke 33 which in turn. is scoured to the rotor shaft 5. The spring ends are mounted on rollers and pins in the usual manner. This construction gives a very rigid device at a low cost.-

What I claim as new is 1. In an inductor generator, the combination of a permanent magnet. a pair of pole pieces, each in magnetic contact with one of the poles of said magnet. one of said pole pieces carrying two polar projections having separable pole faces intiinz-itely united by non-magnetic cast metal with the opposite pole piece.

2. In an inductor generator, the combination of a permanent magnet, a pair of pole pieces each in magnetic eontact with one of the poles of said magnet, one of said pole pieces having two polar projections with separable polar extremities attached to the opposite pole piece with non-magnetic material.

3. In an inductor generation the combination with a permanent magnet. two pole pieces each in contact with the permanent u'iagnet, one substantially ll shaped core of magnetic mater al, a generating winding disposed upon and in innuctive relation to one of the arms thereof, separable pole piece ends for same and attached to the opposite pole piece with non-magnetic material.

4. In an inductor generatior the combination with-a permanent magnet two pole pieces, each in contact with one pole of the permanent magnet, one pole piece having a bifurcated magnetic 0 re. a generating wind ing disposed upon and in inductive relation to one of the arms thereof, separable pole piece ends supported independently of the core; one of which is of a cross sectional area greater than the cross sectional area of that part of the core on which the generating winding is disposed.

5. In an inductor generator, the combination of two l. shaped permanent magnets, a pair or magnetic pole pieces one or" which is made in separable sections with the polar end members secured with non-magnetic material to the other pole piece, and the yoke end formed with a face substantially at right angles to the side faces of the opposite pole piece, the permanent magnets having their ends secured to said faces of the two pole pieces so as to establish unlilte magnetic poles in the latter.

6. An inductor generator, comprising a permanent magnet having pole pieces in which unlike magnetic poles are adapted to be established. one pole piece having a plurality of polar extremities separable from the body of the pole piece and intimateli united by non-magnetic cast metal.

7. An inductor generator, comprising permanent magnet having pole pieces in which unlike magnet-icpoles are adapted to be established, one pole piece having polar projections with separable polar extremities, said polar extremities being secured by nonmagnetic material to the other pole piece.

8. A magneto, comprising a permanent magnet with pole pieces, one having polar projections with'separable polar extremities said polar extremities being formed into substantially integral construction with the other pole piece and separated therefrom by non-magnetic material.

9. In a magneto, a permanent magnet, a base portion forming one pole piece for the magnet, a second pole piece for the magnet having a plurality of polar extremities separable from the body portion of the pole piece and supported by the first-named pole piece and separated therefrom by an intervening body of non-magnetic material.

10. A magneto, comprising a permanent n'iagnet, a base constituting one pole piece of the magnet, a second pole piece of the magnet being formed in sections including a plurality of polar extremities, and a body of non-magnetic material secured to said first-named pole piece and carryingthe polar extremities of the second pole piece.

11. A magneto, comprising a permanent magnet with two poles pieces, one pole piece having a portion, surrounded by a coil, and a separable polar extremity of greater crosssectional area than the coil surrounded portion of the pole piece, said polar extremity being connected to and supported by the other pole piece.

12. In a magneto, a permanent magnet having two pole pieces, one formed in sec tions including a polar extremity, said polar extremity of one pole piece and the other pole piece forming port-ions of a polar unitwith parts shaped to accommodate rotor bearings.

13. A magneto, comprising one or more permanent magnets, and a unitary polar construction therefor composed of a plurality of polar members of; magnetic material separated by and secured together through the medium of non-magnetic material, said unit having aligned axially spaced portions formed to accommodate rotor bearings and the base of the unit being formed by one of said polar members.

14. A magneto, comprising one or more permanent magnets, and a unitary polar construction therefor composed of a plurality of polar members of magnetic material separated by and secured together through the medium of non-magnetic material, one of the polar members having extensions formed to support a rotor.

15. A magneto, comprising one or more permanent magnets, and a unitary polar construction therefor composed of a plurality of polar members of magnetic material separated by and secured together through the medium of non-magnetic material, one of the polar members having an extension for a rotor bearing and constituting a support for rotor actuating springs.

16. A generator having a coil in which a high tension current is induced, and having a stationary body, a contacting device carried by the body and comprising a member arranged to connect with one terminal of the coil and including a fixed safety spark gap, and means for dissipating brnsh discharge between the points of said spark gap.

17. A generator having a coil in which a high tension current'is induced, and having a stationary body, a contacting device carried by the body and comprising a member arranged to connect with one terminal of the coil and including a fixed safety spark gap, and an insulated point arranged adjacent one of the points of the fixed spark gap so as to dissipate brush discharge.

18. A magneto comprising one or more aermanent magnets having a pairo-f pole pleces, one of the pole pieces comprising a pair of polar projections, one surrounded bv a coil and both having their inner ends set into cast non-magnetic material and by the latter being secured together and joined to the other pole piece the polar projections fr ming portion of a core with a part out side the non-magnetic material separable with respect to the parts set and secured therein whereby the coil may be slipped onto one of the polar projections,

19. In a magneto,'one or more permanent magnets having pole )ieces, one constituting the base of the magneto and the other having two polar projections, one polar projection having a coil, and both polar projections having their inner ends held in fixed relation to one another and attached to the first-named pole piece by non-magnetic material cast in contact therewith, the polar projections forming a portion ofa core having a part outside the non-magnetic material separable with respect to the parts held therein wherby the coil may be slipped onto one of the polar projections so as to be positioned in the assembly between the non magnetic material and the magnet or magnets.

20. In a magneto, one or more permanent magnets having pole pieces, one comprising a pair of polar projections, one of which is coil Wound, and both polar projections supported at their inner ends from the other pole piece by non-magnetic material, there being an open space between the inner ends of the polar projections.

21. A magneto frame unit having a bore for a rotor and composed of magnetic and non-magnetic portions, with the magnetic portions imbedded in the nonmagnetic, said unit having on opposite sides of the axis of the bore faces which are adapted to be engaged by magnets, and having on the same side of the axis of the bore a pair of polar members,there being an open space between the imbedded portions of said polar members.

22. A magneto frame unit having a rotor bore and composed of a plurality of parts of magnetic material and non-magnetic material. separating and holding said firstnamed parts in fixed relation to one another, said unit having on opposite sides and disposed in parallel planes a pair of flat faces with which magnets may engage, and also having two of said parts of magnetic material in the form of polar members arranged on one side of the unit and having outer faces in a plane substantially at right angles to the plane of the first-named faces.

23. A magneto frame unit having a rotor bore and composed of a plurality of parts of magnetic material and non-magnetic material separating and holding said first-named parts in fixed relation to one another, said unit having on opposite sides and disposed in parallel. planes a pair of flat faces with which the magnets may engage, and also having two of said parts of magnetic material in the form of polar members arranged on one side of said unit and ha g outer faces in a plane substantially at right angles to the plane of the first-named faces, said polar extremities being spaced circumferentially of the rotor bore.

24. A magnet-o having a rotor, a frame unit provided with a bore for the rotor, magnets and a coil carrying core, the frame unitbeing composed of magnetic and non-magnetic material the magnetic material being imbedded in the nonmagnetic and including two separated polar members of said core arranged on the same side of the axis of the rotor, and said magnetic material being further provided with faces on opposite sides of the frame unit and engaged by the magnets, said rotor having portions constructed to cause a shifting of the magnetic flux in the core as the rotor is driven a portion of the core joining theenibedded portions icing separable from the latter whereby the e :1

can be applied.

In an ignition generator, the combination of a combined base and magnetic pole structure of one polarity, a top pole structure of the opposite polarity comprising a pole piece secured in definite spaced relation to the bottom pole structure and a core arranged to form a magnetic extension of said pole piece a coil mounted on said core, a permanent magnet having one of its poles magnetically connected to the lower pole structure and its other pole similarly connected to the upper part of the said core, and a rotor operatively supported between the opposite pole structures, the top pole structure comprising parts separable to expose end of the core and permit the movement of the coil on and off of the core without dismounting the rotor.

26. A magneto frame unit having a rotor bore and composed of a plurality of parts of magnetic material and non-magnetic material separating and holding said firstnamed parts in fixed relation to one another, said unit .iaving on opposite sides and disposed in parallel planes a pair of flat faces with which magnets may engage, and also having one of said parts of magnetic material in the form of a polar member arranged on one side of the unit and having an outer face in a plane substantially atright angles to the plane of the first-named faces.

In testimony whereof, I have hereunto set my hand this 19th day of November, 1918.

JOHN LEWIS MILTON. 

